The \Magento\Customer\Model\Layout\DepersonalizePlugin beforeGenerateXml() method can be simplified by returning void instead of an array

Issues
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1

This can be simplified to:

/**
 * Before generate Xml
 *
 * @param \Magento\Framework\View\LayoutInterface $subject
 * @return void
 */
public function beforeGenerateXml(\Magento\Framework\View\LayoutInterface $subject)
{
	if ($this->depersonalizeChecker->checkIfDepersonalize($subject)) {
		$this->customerGroupId = $this->customerSession->getCustomerGroupId();
		$this->formKey = $this->session->getData(\Magento\Framework\Data\Form\FormKey::FORM_KEY);
	}
}

A trick: a «before» plugin can return nothing if it needs not modify any argument